4 Complete the text with the present perfect of the verbs in brackets. Green or modern materials in construction ______ (prompt) the expanded use in design projects. This is an important step in redesigning a green building efficiently and as an energy saving source. Concrete is an indispensable green building material as tons are produced year round. Without concrete, many of the world's infrastructure wouldn't be safe. Although much ______ (do) to improve its technology, the breakthrough results go unnoticed. Rock structures ______ (make) it through the history books as a lasting building material. It remains available and the cost is reasonable. Ceramics are useful in areas that are more technical and specialized. Ceramic flooring, counter-tops, fixtures and meticulously, ceilings ______ (be) in many dwellings and building across the nation for a long time. In other numerous countries, ceramic (roofing tiles) materials are used to cover the roof of a building. The improved materials and technical advancements often ______ (be) the result of maintenance and efficiency. Prospects are exciting for certain areas of engaging research. The ultimate goal is to reduce the foot mark the construction industry has on the planet.

Решение:

1. Green or modern materials in construction have prompted the expanded use in design projects. This is an important step in redesigning a green building efficiently and as an energy saving source.
2. Concrete is an indispensable green building material as tons are produced year round. Without concrete, many of the world's infrastructure wouldn't be safe. Although much has been done to improve its technology, the breakthrough results go unnoticed.
3. Rock structures have made it through the history books as a lasting building material. It remains available and the cost is reasonable.
4. Ceramics are useful in areas that are more technical and specialized. Ceramic flooring, counter-tops, fixtures and meticulously, ceilings have been in many dwellings and building across the nation for a long time. In other numerous countries, ceramic (roofing tiles) materials are used to cover the roof of a building.
5. The improved materials and technical advancements often have been the result of maintenance and efficiency. Prospects are exciting for certain areas of engaging research. The ultimate goal is to reduce the foot mark the construction industry has on the planet.

Ответ: 1. have prompted, 2. has been done, 3. have made, 4. have been, 5. have been